Factors of 721

All factors of 721

Here are all 4 factors of 721, listed from smallest to largest.

Factor pairs of 721

These 2 pairs of whole numbers each multiply to give 721.

Prime factorization of 721

Dividing 721 by the smallest prime at each step gives its prime factorization:

The distinct prime factors of 721 are 7, 103. To factorize any other number, use the prime factorization calculator.

Factor tree of 721

A factor tree shows the same prime factorization visually. Each composite branch splits until every endpoint is a prime number.

Properties of 721

What makes 721 interesting

• 721 is a composite number, meaning it has more than two factors. It can be written as a product of smaller whole numbers in 2 different ways.
• 721 is a deficient number: its proper factors sum to 111, which is 610 less than 721 itself.

How to find the factors of 721 yourself

Divide 721 by each whole number starting from 1. Whenever the division leaves no remainder, both the divisor and the quotient are factors. You only need to test up to √721 ≈ 26.85, because every factor above that pairs with one below it.

Reading both columns gives every factor: 1, 7, 103, 721. The factor calculator does this automatically for any number.